Integral roof construction for furnaces



Jane 17, 1930. L, s, ABBOTT 1,764,708.

INTEGRAL ROOF CONSTRUCTIOI FOR FURNACES Fild April 4. 1927 2Sheets-Sheet 1 June 17, 1930. L. s. ABBOTT 1,764308 INTEGRAL ROOFCONSTRUCTION FOR FURIACES' Filed April 4, 1927 '2 Sheets-Sheet, 2.

\ mmmm 2W lyle 54 005072, flAOZZ It is a'further Patented June 17, 1930'jumreo STATES LYLE s'rocxron ABBOTT, or onrcneo, ILLINoIs INTEGRAL ROOFCONSTRUCTION FOR FURNACES Application filed April 4, 1927. Serial No.180,910.

Myinvention relates to an integral roof structure for furnaces and hasfor its Object the provision of a roof of the character that is capableof being readily adapted to an existing furnace setting or a new settingand which may be quickly replaced and repaired.

In a number of plants where a continuous process or treatment is beingcarried on and where furnaces are used in certain steps of the processif the furnaces have to be shut down for repairs, the loss due to theinterruption of the continuous process, is often a very serious one. Theroof of the furnace, subjected to the extreme heat within the furnacechamber, is one of the first parts to need repairing. It is the purposeof this invention to provide a roof which will eliminate the delay andloss incurred in repairing the roof.

Another object of this inventionis to provide a furnace roofof thischaracter which may be adjusted to change the furnace .volumeto meet therequirements of different sizes of charges placed therein for treatmentand thus obtain the best results from the furnace. i i object of thisinvention to provide a roof for furnaces that may be put in place orremoved in its entirety without disarranging the component partsthereof,

. and in which the component parts thereof may be readily adjusted orreplaced in case of da-mage to any part. For instance, if certain of therefractory tile suspended from the framework become so bad after aperiod of service that they must be replaced, the new tire replacingthem may readily be adjusted to align with the old tile left in thestructure. V

Other objects and advantages of theinvention will appear. as thedescription procoeds in connection with theaceompanying drawingswhereinthe preferred form of the invention is illustrated. However, it isobvious tliativarlous modifications may be made in the details ofconstruction without departing from the spirit of the invention and Iintend to avail myself of all such modifications as fall within thescope of the claims. In the drawings mounted upon furnace walls;

Fig. 2 is a transverse section on line 2-- of Fig. 1; I t t Fig. 3 is asection on line 33of;Fig. 2, Fig. 4 is a detailed view showing theparticular device used for suspending the refractory tile from the framework; and

' Fig. 5 is a fragmetary detail illustrating a modified means formaintaining the tile units in proper position.

Referring now in detail to the drawings,

the numeral indicates a furnace having the side walls 11, 12, 13 and 14which are adapted to have supported thereon my improved roof structure.This structure as shown is composed of a pair of channel beams 15 and 16which are spaced substantially the width of the furnace and have theirends supported on the side walls by means of the jacks 17, 18, 19 and 20or other suitable means whereby the channel bar may be moved verticallywith respect to the furnace walls so as toadjust the height of the roof.As shown, each of these channel bars is also provided with a pair ofupstanding projections 21 which are provided with openings 22 to receivehooksor other suitable means for lifting the channel bars and thestructure supported thereby so that the entire device may be removed asa unit from the furnace. Extending between the two channel bars 15 and16are a plurality. of T-bars 2 1- which are substantially parallel andserve as a means for supporting the refractory tile in the manner whichwill be presentlyexplained. These T-bars as shown clearly in Fig. 1, arerigidly connected to the channel bars by means of theangle irons havingthe portions 25 secured against the Flg. 1 1s a plan view showmg mydev1ce which is rounded so as to present a smooth surface for the saddleto rest upon. The central portion 29 of the saddle is also roundedtransversely as shown in Fig. 5 at '31, so that the saddle may rockabout an certain amount of angular adjustment in the same. The saddles28 are provided with a pair of openings at the opposite ends thereof andthe U-bolts 32 have their legs 33 and 34 extending upwardly throughthese openings and screw-threaded toreceive the nuts 35 and'36, wherebythey may be adjusted vertically with respect to the saddles. This firmlysecures the, U-bolts upon the T-bars and there is no danger of theirbeing displaced upon movement of the roof because each U-bolt togetherwithfits corresponding saddle completely surrounds'the T-bar so that itcannot be removed therefrom with out removal of the butts 35 antv Thesaddles and the corresponding U-bolts may he slid longitudinally alongthe 'T-bars to any desired position, as in instances where the size ofthe furnace is known, together with the size of refractory blocks used,if it is so desired the T-bars may be notched as shown in Fig. 5 at 37,to provide a seat in which the saddles may rest and this will serve toproperly space the saddles and U-bolts along their respective T-bars.

Each of the U-bolts "carries ahanger bar 40 which in turn has supportedthereon a plurality of refractory blocks 41 which form the refractorylower surface for the furnace roof. ,As shown, the hang-er bars have acentral lug portion 42' provided with an opening 43 through whichthe'U-bolt ex- I tends, and this opening as shown in Fig. 4 is roundedat the upper surface thereof to permit adjustment of the hanger bar withrespect to theU bolt. The hanger bar is also provided at theoppositeends thereof with projecting portions 44 and 45 which serve tohold the refractory elements 41 in position thereon, but permit them tobe removed by liftingthem vertically with respect to the hanger bar andthen removing them endwise from said bar. The refractory elements 41each are provided with around hole 46 to receive the hanger bar, andeach of the blocks isalso recessed adjacent the upperend thereof as at47, to provide a thinner upper portion through which the stantiallyplane. Thus when a set of four blocks are assembled upon a hanger bar,the two inner blocks have the recessed faces turned toward each other toprovide a space therebetween for the lug 42 and the corresponding U-bolt32 engaging said lug. The two outer blocks are then placed with theirplane faces in engagement with the two plane faces of the inner blocksso that the recesses on these blocks wil. face outwardly, and by thismeans of assembly the lower thicker portions of the blocks will extendto beyond the ends of the hanger bar and abut with the next adjacentunit so as to form a substantially closed joint.

The provision of the round holes in the block 4l together with theprovision of the curved or rounded upper surfaces 48 on the hangerbarscause a good bearing surface for each block and in addition permitsthe block to adjust itself relatively to the hanger bar so that it isnot placed under any strain except that of its own weight in dependingfrom the hanger bar.

From the above description it is thought that the construction of myimproved roof will be clear to one skilled in this art. The provision ofthe channel bars and their connection with the T-bars provides a rigidframe work which may be handled with comparative safety, and the mannerof suspending the refractory blocks from the T-bars assures extremeflexibility of the roof in adjusting itself to various conditions.

The particular suspension means also permits removal of the roof fromthe furnace replacement thereof without any removal of parts or seriousdanger of breakage of the elements, since each row of refractory tile iscapable of movement with respect to the frame within limits, but cannotbe'removed therefrom dueto swinging the frame around when it is movedoff with a crane or other suitable means and a new furnace roof isplaced upon the furnace. I

Also the provision of the means for adjusting the channel bars up anddown provides a simple means of changing the volume of the furnacechamber so that the best results canbe obtained for any particularcharge to be heated in the furnace. Thus when an extremely small chargeis to be heated, or a series of such charges, the furnace roof can bedropped down to cut down the volume of the furnace and in this manner agreater efiiciency as well as a greater speed in heating up the chargescan be obtained.

The adjustment provided by use of the U-bolts also permits thereplacement of any unit of tile supported by hanger bars with a new unitwhich can be adjusted so that lower end will be, substantially flushwith the lower end "of the old tileremaining in the roof, and in thismanner the sudden burning off of thenew tile placed in the roof"standing sidewalls around the furnace chamdue to the fact that it isexposed below the tile which are partly burned off, is prevented. V 7

Having thus described my invention, what I claim and desire to secure byU. S. Letters from and hanger bars pivoted to said U bolts carrying saidrefractory material.

2. A roof for furnaces comprising a rigid framework having a pair of endbars and spaced cross bars connecting said end bars, hanger barssupported by said cross bars and supporting a plurality of refractorytile members to form a refractory lower face for said roof, said endbars having members adjustably mounted on-the opposite ends thereof forengagement with the furnace walls whereby the roof may be raised orlowered with respect to the furnace, said roof being bodily removablefrom saidfurace as a unit.

3. In a furnace construction having upber, a roof of refractory materialfor said furnace and supporting means for said refractory materialcomprising a framework including a plurality of substantially parallelcross bars and saddle members resting upon said cross bars, U-boltshaving the legs thereof extending on opposite sides of the cross barsand secured to said saddle members and hanger bars pivoted to said U"-bolts carrymg sald refractory material.

4. A roof for furnaces comprising a rigid framework having a pair. ofend bars and spaced cross bars connectingsaid end bars, hanger barssupported by said cross bars and supporting 'a plurality of refractorytile members to form a refractory lower face for said roof, said endbars carrying a plurality of supporting members having screw threadedengagement with said end bars and adapted to rest on the furnace wallswhereby said roof may be adjusted vertically on said furnace and bodilyremoved therefrom.

5. A roof for furnaces comprising a framework having means thereon forsuspending refractory tile elements therefrom to form a roof ofrefractory material for a furnace and having portions projecting be yondthe boundary of the refractory material serving to support the frameworkon the vertical walls of a furnace, and means carried by said portionsresting on said vertical walls for adjusting said roof vertically tovary the furnace volume, said last named means and framework beingbodily removable from said furnace as a unit.

In Witness whereof, I hereunto subscribe my name this 29th day of March,A. D. 1927.,

LYLE STOCKTON ABBOTT.

